Tying in after a break
Fear is a natural part of our sport, because climbing is inherently dangerous. We can mitigate the consequences of a fall by using proper equipment, like rope in sport climbing or crash pads in bouldering, but we can not remove heights from the equation, because this sport is about scaling them. And a fall from height can be fatal, hence the consequences of an accident are most of the time very serious. The overall probability of an injury, however, is much smaller than in many other sports or activities. Climbing can be objectively safer than driving a car, if you do everything by the book, nevertheless the small but real possibility of falling to your death or seriously injuring yourself stimulates the imagination. Humans did not evolve to feel comfortable at heights, but as with most of fears it can be alleviated. We surely didn't evolve to feel comfortable moving 120 km/h in a metal can, but after years of doing it most of us don't even think about potential consequences...